Device for converting motion in sewing-machines



2 Sheets-Sheet 1.

(No Model.)

DAROY PORTER. DEVICE FOR-CONVERTING MOTION IN SEWING MACHINES.

Patented May 9, 1882,

WITNESSES INVENTOR ATTORNEYS 2 Sheets+$het 2.

(No Model.)

'DARGY PORTER. vDEVIGE FOR GONVERTIN GYMOTION IN SEWING MAGHINES.

Patented-May9,188Z;

INVENTOR W E N R o T T A N. PETERS Pmwuxm nwr. Washington. D. c.

UNITED STATES PATENT OFFICE.

DAROY PORTER, OF CLEVELAND, OHIO.

DEVICE FOR CONVERTING MOTION INSEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 257,609, dated May 9, 1882.

Application filed January 24, 1882. (No model.)

To all whom it may concern:

Be it known that l, DAncr PORTER, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Devices for Convertin g Motion in Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to devices for converting motion; and it consists in thepeculiar construction of the several parts, as will be hereinafter fully set forth and claimed.

In the drawings, Figure 1 is a view in front elevation of a portion of a sewing-machine constructed according to my invention. Fig. 2 is an end view of the same. Fig. 3 is'a vertical section taken through the shuttle-operating lever. Fig. 4 is a vertical section taken through the feed-operating lover or 'pitman. Figs..5 and 6 are detached views,in seeti'on,of some of the parts, showing more clearly their construction.

In the said drawings, A represents the standard of an ordinary sewin g-machine,adapted to hold and support the operative parts of my device.

B represents the main horizontal driving shaft, which is provided with a crank, B. This driving-shaft Bis provided with a split bushing, 0, which acts as a bearing for said shaft B, and also as a bushing to fill the hole D, which is formed in the rear of the standard A, and which is made large enough to admit of the passage of the crank B on the shaft B. A set-screw, a, passing through from the outside of the standard A in such a manner as to press against the side of the bushing, acts to hold said bushing in place in the standard and at the same time take up any wear that may occur. The split in the bushing allows it to be compressed by means of said set-screw a.

E represents the pitman, which is secured to and driven by the crank B, "its lower end being pivoted to a crank on the feed-shaft E The manner of constructing this pitman E is shown more clearly in Fig. 4, where it is shown as being split down to a short distance below its connection with the radius-bar F. By constructing it in this manner it allows of the up per end being sprung apart far enough to pass overthe crank B, when it may be again closed a and secured and caused to hug or embrace thesaid crank B by means of aset-screw, b, which also acts to take up any wear that may occur between the crank B and the upper end of the pitman E.

The manner ofconnccling the radius-barF to the pitman E is as follows: A hole,c,is formed near the centerof the pitman E, of suflicientdiameter to admit a split ball-bushing,F,in which is journaled the screw d, the head of whichis somewhat larger than the hole 0. The other end or point of the screw (1 is provided with a short screw-thread, which screws into one end of the radius-barF snugly, and in such a manner that the oscillating of the said radiusbar will not tend to loosen it. This ball-bushing F allows a universal movement between the radius-bar F and the pitman E, so that any irregularity in the difierent parts may be accommodated in setting up the machine, and being split,(see Fig. 4,) any wear between the screw d and bushing may be taken up by means of the set-screw c, which passes through the pitman E a short distance above the said bushing F.

G is a lever, the upper end of which is provided with a yoke, G, in which moves the crank B, and the lower end being connected in any suitable manner to the shuttle-driving lever H. This lever G is constructed as shown in Fig. 3viz., the upper end is bifurcated, thus forming the yokeG. For a shortdistance below the bottom or lower end of the yoke G a slot, f, is cut, and a set-screw, g, passing through the lever Get a right angle to said slot f and through it, acts to adjust the sides of the said yoke G to the crank B. The upper end of the yoke G is also provided with a set-screw, h, which passes through only one of the arms and abuts or presses against the other. The function of this screw it is to .keep the inner sides or walls of the yoke G parallel or equidistant apart, the tendency of the lower screw, g, being to cause the upper ends to close more than the lower part. Near the center of the lever G, or at the point where it is pivoted to the standard A, it is slotted for a considerable distance, the said slot running into the bearing 2', and thus allowing the rear .of these parts to be taken up by means of aset-screw or set screws j.

The operation of the ditt'erent parts while in motion is described in patent to Porter and White, No. 250,169, dated November 29, 1881, and hence I have not more fully described it here.

What I claim is- 1. In asewing-machine,thecombinatiolnwith a crank-shal't'a'nd an oscillating lever, of a pitinan constructed with two yielding arms made integral therewith, the outer ends formed as hearings to fit upon the crank,and a set-screw inserted through the yieldingarms to take up for wear, a split bushinginserted in a circular bearing formed between the yielding arms,

and a radiusbar connected at one end to the oscillating lever, and at the other end mounted on a bearing supported in said split bushing, substantially as set forth.

2. In a sewing-machine, the combination, with the crank B and pitman E, said pitman being split, substantially as shown, of the radius-bar F, said radius-bar being connected to the pitman by means of a screw, 01, passing through asplitball-bushing, F, substantially as and for the purpose shown and described.

In testimony \vhercot'lhave signed my name to this specification in the presence of two sub scribing witnesses.

DAROY PORTER,

\Vitnesses:

W. E. DONNELLY, ALBERT E. LYNCH. 

